Preparation method and expansion preparation device of soil heavy metal repair agent

Abstract

The embodiment of the invention discloses a preparation method of a soil heavy metal repair agent. The preparation method comprises the steps that a biological by-product is roughly screened and crushed; after a catalyst is added, high-temperature pressurized digesting is conducted; after a reaction agent is added, high-temperature expansion, low-temperature fermentation, dehydrating and drying are conducted, and thus a preliminary product is prepared; and the preliminary product is crushed again and subjected to purging filtering, and thus a final product is formed. An expansion preparation device of the soil heavy metal repair agent comprises a high-pressure compartment provided with a feeding inlet and a discharging outlet, and a material flat-crushing mechanism mounted in the high-pressure compartment, a fluidifying material-transferring bed is arranged between the material flat-crushing mechanism and the feeding inlet, the discharging outlet is connected with an expansion cavity,the side wall of the near-bottom of the high-pressure compartment is connected with a steam generating device through an air delivery pipeline, the top of the high-pressure compartment is connected tothe steam generating device through a circulating pipeline, and a pressure relief valve is arranged on the circulating pipeline. The soil heavy metal repair agent has a long-term stable passivation repair effect, secondary pollution is avoided, soil fertility can be increased, and phytonutrients are formed advantageously.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of remediation of heavy metal pollution, and in particular to a method for preparing a soil heavy metal remediation agent and a puffing preparation device. Background technique [0002] At present, the research on soil in-situ passivation restoration technology is developing rapidly. By introducing passivators such as silicon-calcium substances, phosphorus-containing substances, organic materials, metals and their oxides into the remediation target soil, the immobilization / stabilization of heavy metals can be achieved. process, reduce its bioavailability and mobility of heavy metal ions, and achieve the purpose of soil function restoration; [0003] Calcium silicon is represented by lime. The application of lime in farmland increases the soil pH, promotes the adsorption of heavy metal cations, forms heavy metal silicate precipitation and reduces the mobility and bioavailability of h...

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Problems solved by technology

[0006] For this reason, the embodiment of the present invention provides a method for preparing a soil heavy metal remediation agent and an expanded preparation device, realizing a low-cost, high-efficiency composite heavy metal pollution remediation technology and remediation agent, and the remediation agent has long-term stable passivation repair. Effect, does not introduce secondary pollution and can increase soil fertility, which is conducive to the formation of plant nutrients. At the same time, the expansion device solves the problems of poor expansion effect and complicated expansion process in the process of repairing agent preparation.

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